"Personal preference" refers to an individual's choice or liking for something based on their own taste or opinion. It reflects what someone personally prefers or enjoys. Full definition
The nutritional value of protein, fiber, vitamins, minerals and antioxidants is negligible and is merely based on personal preference of color. (amazon.com)
This factors into the weight of the overall project, but it is just personal preference really. (hazelandgolddesigns.com)
The cosmetic adjustments to your characters are for you own personal preference of how you want your fighters to look, and can add details to your characters overall appearance. (community.wbgames.com)